我正在编写一个简单的代码来测试hibernate，它包含主类，模型类和hibernate配置文件。但是我的日志在打印行后被卡住了
**Hibernate: drop table if exists USER_DETAIL**
模特课程：
package com.test.hibernate.koushik;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Lob;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.Transient;
@Entity
@Table(name="USER_DETAIL")
public class UserDetails {
@Id
@GeneratedValue
@Column(name="USER_ID")
private int userId;
@Column(name="USER_NAME")
private String userName;
public int getUserId() {
return userId;
}
public void setUserId(int userId) {
this.userId = userId;
}
public String getUserName() {
return userName + " From getter";
}
public void setUserName(String userName) {
this.userName = userName;
}
}
主要课程：
package com.test.hibernate.koushik;
import java.util.Date;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
public class Main {
public static void main(String[] args) {
// TODO Auto-generated method stub
UserDetails userdetail = new UserDetails();
userdetail.setUserName("Hemkar");
SessionFactory sessionFactory= new AnnotationConfiguration().configure().buildSessionFactory();
Session session= sessionFactory.openSession();
session.beginTransaction();
session.save(userdetail);
session.getTransaction().commit();
session.close();
sessionFactory.close();
}
}
配置xml文件
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/test_db</property>
<property name="connection.username">root</property>
<property name="connection.password">root</property>
<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>
<!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- Disable the second-level cache -->
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<!-- Drop the existing tables and create new one -->
<property name="hbm2ddl.auto">create</property>
<!-- Mention here all the model classes along with their package name -->
<mapping class="com.test.hibernate.koushik.UserDetails"/>
</session-factory>
</hibernate-configuration>
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Mar 19, 2015 12:32:27 PM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {4.0.5.Final}
Mar 19, 2015 12:32:27 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {4.3.8.Final}
Mar 19, 2015 12:32:27 PM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
Mar 19, 2015 12:32:27 PM org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
Mar 19, 2015 12:32:27 PM org.hibernate.cfg.Configuration configure
INFO: HHH000043: Configuring from resource: /hibernate.cfg.xml
Mar 19, 2015 12:32:27 PM org.hibernate.cfg.Configuration getConfigurationInputStream
INFO: HHH000040: Configuration resource: /hibernate.cfg.xml
Mar 19, 2015 12:32:27 PM org.hibernate.internal.util.xml.DTDEntityResolver resolveEntity
WARN: HHH000223: Recognized obsolete hibernate namespace http://hibernate.sourceforge.net/. Use namespace http://www.hibernate.org/dtd/ instead. Refer to Hibernate 3.6 Migration Guide!
Mar 19, 2015 12:32:27 PM org.hibernate.cfg.Configuration doConfigure
INFO: HHH000041: Configured SessionFactory: null
Mar 19, 2015 12:32:28 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
WARN: HHH000402: Using Hibernate built-in connection pool (not for production use!)
Mar 19, 2015 12:32:28 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH000401: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/test_db]
Mar 19, 2015 12:32:28 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH000046: Connection properties: {user=root, password=****}
Mar 19, 2015 12:32:28 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH000006: Autocommit mode: false
Mar 19, 2015 12:32:28 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
INFO: HHH000115: Hibernate connection pool size: 1 (min=1)
Mar 19, 2015 12:32:28 PM org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect
Mar 19, 2015 12:32:28 PM org.hibernate.engine.jdbc.internal.LobCreatorBuilder useContextualLobCreation
INFO: HHH000423: Disabling contextual LOB creation as JDBC driver reported JDBC version [3] less than 4
Mar 19, 2015 12:32:29 PM org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateService
INFO: HHH000399: Using default transaction strategy (direct JDBC transactions)
Mar 19, 2015 12:32:29 PM org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory <init>
INFO: HHH000397: Using ASTQueryTranslatorFactory
Mar 19, 2015 12:32:30 PM org.hibernate.tool.hbm2ddl.SchemaExport execute
INFO: HHH000227: Running hbm2ddl schema export
Hibernate: drop table if exists USER_DETAIL
这个应用程序无法创建表的原因是什么。
答案 0 :(得分：1)
首先检查您的数据库中是否已有此表，如果这样做，请尝试删除手册并再次运行代码，如果不起作用，请尝试这样做。
<强>的persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="Test">
<class>test.UserDetail</class>
<properties>
<property name="hibernate.connection.username" value="admin"/>
<property name="hibernate.connection.password" value="admin"/>
<property name="hibernate.connection.url" value="jdbc:oracle:thin:@//..."/>
<property name="hibernate.connection.driver_class" value="oracle.jdbc.driver.OracleDriver"/>
<property name="hibernate.cache.provider_class" value="org.hibernate.cache.NoCacheProvider"/>
<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle9Dialect"/>
<property name="hibernate.connection.autocommit" value="false"/>
<property name="hibernate.hbm2ddl.auto" value="create"/>
</properties>
</persistence-unit>
<强> EntityManagerUtil.java 包装测试;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
public class EntityManagerUtil {
private static EntityManagerFactory factory = null;
private static EntityManager em = null;
public static EntityManager getEntityManager(){
if (factory == null) {
factory = Persistence.createEntityManagerFactory("Test");
}
if (em == null){
em = factory.createEntityManager();
}
return em;
}
}
<强> Main.java
package test;
import javax.persistence.EntityManager;
public class Main {
public static void main(String[] args) {
// TODO Auto-generated method stub
UserDetail userdetail = new UserDetail();
userdetail.setUserName("zzzz");
EntityManager em = EntityManagerUtil.getEntityManager();
em.getTransaction().begin();
em.persist(userdetail);
em.getTransaction().commit();
em.close();
System.out.println("insert with success");
}
}